Centrifugal pump



C. W. LINDEMANN June 12,

CENTRIFUGAL PUMP Filed A ril 3O 1927 Z Z/ 4.. Q0 2 Patented June 12,1928.

UNITED STATES CLARENCE W. LINDEMANN, OF CHICAGO, ILLINO PANY, OFCHICAGO, ILLINOIS,

, ASSIGNOR 'ro cnrcaeo rump com- A co RATION or rumors.

CENTRIFUGAL 2111132.

Application filed April 30, 1827. Serial No. 187,820.

This invention relates to centrifugal pumps and more particularly to thebaffles, which are usually employed at the inletof the impeller. As iswell understood one or more baflies are employed in the fluid supplypassage or suction chamber of the pump at the place where said assageleads to the inlet of the impeller, t e purpose of baflles being toreduce the whirling movement of the fluid while passing from the suctionchamber to the inlet of the impeller. The principal object of thepresent invention is to provide improved means for connecting the bafileor bafiles with the pump casing.

Another object is to provide a baffle which may be readily attached toor removed from the pump casing. Another object is to provide attachingmeans between the baflie and easing which will not interfere with theordinary machining of the casing. With these and other objects andadvantages in view this invention consists in a centrifugal pump havingone or more baflles removably secured to one of its case walls. The in.-vention further consists in a centrifugal pump having a wall formed withan undercut recess in which is removably secured the base portion of abaflle. It further consists in a centrifugal pump provided with aplurality of readily. removable baflles having interlocking connectionswith a packing retaining ring whereby said ring may be held againstendwise pressure. The lnvention further consists in the several novelfeatures hereinafter fully set forth and claimed.

The invention is clearl illustrated in the drawing accompanying t isspecification, in which:

Fig. 1 is a view partly in side elevation and partlyin central,vertical, longitudinal section of a centrifugal pump embodying a simpleform of the present invention; Fig. 2 is a detail vertical cross sectiontaken on the line 2-2 of Fi 1; Fig. 3 is a detail horizontal section taen on the line 3-3 of Fig. 2; Fig. 4: is a fragmental perspective viewof the lower portion of the pump case; Fig. 5 is a side elevation of apacking retaining ring and Fig.6 is a perspective view of one of thebafiies forming the subject matter of this specification.

Referring to said drawing, which illustrates a simple embodiment of thepresent invention, the reference character 10 designates the uppersection of a pump case of conventional form and 11 designates the lowersection thereof. The upper and lower sections are provided with lateralflanges 12 bolted together by bolts 13 as is usual. The pump case isformed with a chamber 14 in which is contained an impeller 15 of theordinary type and said impeller is mounted upon an impeller shaft 16,which extends out through packing boxes 17 formed on the case. The endsof said impeller shaft are journaled in suitable bearings (not shown)usually provided on the ends of bracket arms 18 that are formed on orsecured to the lower case section 11. In the type of centrifugal pumpshown there are two fluid supply passages 19, one on each side of theimpeller chamber 14, which fluid passages constitute suction chambersthat terminate in annular spaces 20 surrounding the impeller shaft andlead into the inlets 21 of the impeller. Each inlet extends in a planetransverse to the axis of rotation of the impeller. It has been foundthat without the use of baiiies, a whirling movement is imparted to' thefluid in passing from the suction chamber to the inlet of the impellerand to minimize this whirling movement, one or more bafiles 22 areprovided in the suction chamber which baflies extend parallel with theaxis of rotation of the impeller and resist the whirling action of thefluid or the formation of eddy currents therein near the impellerinlets.

In the present form I have illustrated two battles for each inlet of theimpeller, one baflle being provided above and one below the impellershaft. Each baflie is formed with a blade or wing 23 and with a base 24of any suitable form but somewhat thicker than the thickness of theblade or Wing 23. The pump sections are formed with undercut recesses 25of the same size and shape as the bases 24 of the bafiles and receivesaid bases of the baflies and hold the baflies in place in the suctionchamber. The undercut recesses 25 extend radially from the bore 26 ofeach packing box 17 whereby when the two sections of the pump shaft aredisconnected and taken apart the bases of the baffles may be inserted inthe recesses 25 or removed therefrom. Within the packing boxes 17 ispack ing 27, and a packing retaining ring 28 is provided at the innerend of each packing box which packing rin has an interlockin connectionwith each 0 the associated baffles 110 212. As shown the packingretaining ring 28 is provided with radially extending pins 29 that entersockets or holes 30 formed in the bases 24 of the battles. It will beevident that with the bases of the battles seated in 'the undercutrecesses 25 and with this pins 229 of the packing retaining rings seatedin the holes 30 of the baffle bases, endwise movement of the packingretaining ring will be eil'ectively prevented. The usual gland ill andtake up devices are provided at the outer end of each packing box forsupplying the necessary pressure on the packing.

In assembling the parts the bafiies are inserted into the'undercutrecesses 25 while the two sections 10, 11 of the pump case aredisconnected from each other and the packing retaining rings, packingrings and glands are placed upon the impeller shaft and with theimpeller fast on the shaft, said parts are placed in the lower sectionof the casing and the upper section thereafter placed on the lowersection and bolted thereto. The ends of the shaft arecontained in thebearing at the outer end of the bracket arms 18 as has been explained.

It will be observed that the usual machining of the parts of the casingrequiring machining is not in any manner interfered with by the bafflesor parts that hold them in place. Furthermore, the baffles serve to holdthe packing retaining rings in place against endwise movement on theshaft. The blades or wings of the baflles minimize the tendency for thefluid to whirl or form eddies while passing from the suction chamber tothe inlet of the impeller. While the invention has been shown inconnection with a centrifugal pump having two fluid inlet passages orsuction chambers, it is to be observed that the battles may be providedfor a single inlet centrifugal pump and that one or a plurality ofbaflies embodying the construction described may be employed at eachinlet side of the impeller.

More or less variation of the exact details of construction is possiblewithout departing from the spirit of this invention; I desire.therefore. not to limit myself to the exact form of the constructionshown and described, but intend, in the following claims, to point outall of the invention disclosed herein.

I claim as new and desire to secure by Letters Patent:

1. In a centrifugal pump, the combination with a pump case comprisingtwo secured together sections and formed with an impeller chamber, asuction chamber and a bore for the reception of a shaft, an impellershaft in said bore and an impeller on said shaft within said impellerchamber and having an annular inlet in a plane transverse to the planeof rotation, and into which inlet said suction chamber leads, of abaflie located in ber, a bore for a shaft and a undercut recess leadingfrom said bore, an impeller shaft in said bore and an impeller on saidshaft within said impeller chamber and having an annular inlet in aplane transverse to the plane of rotation,'and into which inlet saidsuction chamber leads, of a baflie located in said suction chamber andhaving an enlarged base portion located entirely at one side of theshaft and secured in saidundercut recess and removable throughsaid bore,said bafiie acting to reduce whirling of fluid passing from the suctionchamber to the inlet of the impeller.

3.- .In a centrifugal pump, the combination with a pump case comprisingsecured together top and bottom sections, and formed with an impellerchamber, a suction cham-. her, a bore for a shaft and an undercut recessleading from said bore, a packing and a packing retaining ring in saidbore, an impeller shaft in .said bore and an impeller-on said shaftwithin said impeller chamber and having an annular inlet in a planetransverse to the plane of rotation, and into which inlet said suction'.chamber leads, of a bafile located in said suction chamber and having anenlarged base portion secured in said undercut recess and removablethrough said bore, said baflie having an interlocking connection withsaid packing retaining ring v for holding said ringagainst endwisemovement and acting to reduce whirling of fluid passing from the suctionchamber to the inlet of the impeller.

4. In a centrifugal pump, the combination with a pump case comprisingsecured together top and bottom sections, and formed with an impellerchamber, a suction chamber, a bore for a shaft and an undercut recessleading from said bore, a packing and a packing retaining ring in saidbore, an impeller shaft in said bore and an impeller on said shaftwithin said impeller chamber and having an annular inlet in a planetransverse to the plane of rotation, and into which inlet said suctionchamber leads, of a battle located in said suction chamber and having anenlarged base portion secured in said undercut recess and removablethrough said bore, said packing retaining ring having pins engaging inholes in the base of the baflie whereby said ring is held againstendwise movement, and said baflle acting to reduce whirling of. fluidpassing from the suction chamber to the inlet of the impeller.

5. In a centrifugal pump, the combination with a pump case comprisingsecured together sections and formed with an impeller chamber, a suctionchamber and a bore for the reception of a shaft, an impeller shaft insaid bore and an impeller on said shaft within said impeller chamber andhaving an annular inlet in a plane transverse to the plane of rotation,and into which inlet said suction chamber leads, of bafile platescontained in said suction chamber, one at each side of said impellershaft, each baflie having an enlarged base portion located entirely atone side of the shaft and removably secured in an undercut recess formedin the wall of the pump case, and said baffles acting to reduce whirlingof fluid passing from the suction chamber to the inlet of the impeller.

CLARENCE W. LINDEMANN.

